The bass line is the headline. JBL rates the L100 MKII down to 40 Hz and the L150 down to 32 Hz, and both figures are at -6 dB. So unlike most spec-sheet comparisons, these two numbers are measured the same way. That is a real step, close to a third of an octave deeper.
One thing does not get better. The L150 is rated at 88 dB, two below the L100 MKII’s 90 dB, at the same 4 ohms. The bigger speaker is slightly harder to drive, not easier.
We hold 19 passive speakers with a 15-inch woofer. Most of them are expensive. The L150 is the third cheapest:
| FEATURE and SPECS COMPARISON | |  |  |  |
| Model | JBL L150 Classic | Klipsch Heritage Cornwall IV | Fyne Audio Vintage Classic X |
| Speaker Type | Passive Floor-standing | Passive Floor-standing | Passive Floor-standing |
| Enclosure Type | Ported | Ported | Ported |
| Driver Setup | 3-way | 3-way | 2-way |
| Mid-Range | 6.5" Polymer-coated Pure Pulp Midrange | 1.75" polyimide diaphragm compression horn-loaded Midrange | - |
| Woofer | 1 x 15" Pure Pulp Woofer | 1 x 15" Fiber composite Woofer | x 10" Woofer |
| Frequency Range / Low | 32Hz | 34Hz | 28Hz |
| Frequency Range / High | 22kHz | 20kHz | 26kHz |
| Impedance Nominal | 4Ω | 8Ω | 8Ω |
| Sensitivity | 88dB | 102dB | 94dB |
| Max Power (RMS) | 250w | 100w | 280w |
| Grille | Yes | Yes | Yes |
| Height | 935.0mm | 966.0mm | 916.9mm |
| Width | 470.0mm | 643.0mm | 449.6mm |
| Depth | 540.0mm | 394.0mm | 381.0mm |
| Weight | 58.50kg | 44.55kg | 45.18kg |
| MSRP(pair) | 9999USD | 7300USD | 8999USD |
| Check Current Price | Amazon | Amazon | Amazon |
The Klipsch Cornwall IV is the rival ecoustics names, and the one readers already open. Since August it is the 134th most compared speaker we hold, just above the L52 Classic. It costs $2,699 less. It has a 15-inch woofer too, and a box of almost the same size, about 245 litres against the L150’s 237. But it is shaped very differently. It is 643 mm wide against 470, and 394 mm deep against 540. It is rated to 34 Hz. Its mid and treble come from horns, not domes.
We had the Cornwall IV at $6,598 a pair. That was out of date. US dealers now sell it at $3,649.99 each, about $7,300 a pair, and I have corrected our record.
The Fyne Audio Vintage Classic X is the other rival ecoustics names, at $8,999. It has a 10-inch coaxial driver rather than a 15-inch woofer. Fyne rates it to 28 Hz at 94 dB and 8 ohms. We do not hold the tolerance behind that bass figure, so read it as a rough guide next to JBL’s -6 dB number, not a ranking.
JBL L150 Classic and Klipsch Cornwall IV front views to scale, 470 mm wide against 643 mm
The catch: 88 dB and 4 ohms on a 15-inch speaker
Big woofers usually mean easy loads. The Cornwall IV is the classic example. The L150 goes the other way, and that is the single most important thing to know before you buy it.
JBL quotes 88 dB at 2.83 volts. Into 4 ohms, 2.83 volts is 2 watts, not 1. So per watt, the L150 is closer to 85 dB. The Cornwall IV’s 102 dB is quoted into 8 ohms, where 2.83 volts is 1 watt. Like for like, that is 17 dB apart, so the Cornwall plays as loud on about one fiftieth of the power.
Here is what that means in a room, worked out on paper. Take a pair of speakers, 3 metres from your seat, and loud peaks of 100 dB:
- JBL L150 Classic: about 140 watts per channel
- Fyne Audio Vintage Classic X: about 18 watts per channel
- Klipsch Cornwall IV: about 3 watts per channel
A real room adds a few dB of help, so treat those as upper figures. But the gap between them is the point, and it does not shrink. The L150 wants a strong amplifier that is happy into 4 ohms. JBL recommends up to 250 watts. A 30-watt tube amp that would run a Cornwall all evening is the wrong partner here. If you already own an amplifier, the amp-speaker matcher checks it against the L150’s sensitivity and impedance and your room size.
The JBL L150 Classic front panel with its HF and LF level controls, each stepped from -2 to +2 dB
The press figures and JBL’s page do not agree
The launch coverage and JBL’s own product page give different numbers in three places. I used JBL’s page for our record.
- Weight: ecoustics has 52 kg each. JBL’s page says 58.5 kg.
- Lower crossover: the press release has 310 Hz. JBL’s page says 300 Hz.
- Bass: the press release has 33 Hz, or 30.5 Hz with the LF control at +2 dB. JBL’s page says 32 Hz at -6 dB with the control at 0 dB.
None of these changes the picture. But they are a reminder to check the maker’s page, not a reprint of it.
Price is less tidy. HARMAN’s figure is $9,999 a pair. One US dealer, Safe and Sound HQ, already lists it at $11,999.90 a pair. JBL’s own store shows it as sold out with no price. I have used $9,999. If the dealer price turns out to be the real one, the L150 moves from $2,699 above the Cornwall to $4,700 above it.
JBL L150 Classic with the grille off, showing the sloped front baffle and the two front ports
Who the L150 is not for
Low-power amplifiers. Covered above, and it is the big one. At 88 dB and 4 ohms, this is not a speaker for a small tube amp or a budget receiver.
Small rooms. A 15-inch woofer rated to 32 Hz in a small room tends to give you room boom, not clean bass. The LF control helps a little, but only by 2 dB either way.
Anyone who mainly wants the look. The L100 Classic MKII has the same grille, the same walnut and the same 1970s face for $4,800. Add a good subwoofer and you can get the deep bass for less than the L150 costs. You lose the single big box, and you gain a speaker that is easier to drive.
Anyone who needs it now. It ships in 2027, and no one has measured one yet.
The L150 Classic is the first L Classic floorstander: a 15-inch three-way at $9,999 a pair, rated to 32 Hz at -6 dB, eight hertz deeper than the L100 Classic MKII. It is the third cheapest 15-inch speaker we hold. It is also the least sensitive one, at 88 dB and 4 ohms, so it needs a strong amplifier. If you want a 15-inch speaker for a small amplifier, the Klipsch Cornwall IV is the one to look at.
Questions answered
How much does the JBL L150 Classic cost?
HARMAN’s suggested price is $9,999 a pair. It ships in 2027. One US dealer already lists it at $11,999.90 a pair, so check the price when it arrives.
What is the difference between the JBL L150 Classic and the L100 Classic MKII?
The L150 is a floorstander with a 15-inch woofer and a 6.5-inch midrange. The L100 MKII is a stand-mounted speaker with a 12-inch woofer and a 5.25-inch midrange. The L150 is rated to 32 Hz and the L100 MKII to 40 Hz, both at -6 dB. The L150 is 2 dB less sensitive, at 88 dB against 90. It costs $9,999 a pair against $4,800.
Does the L150 Classic replace the L100 Classic?
No. It sits above the L100 Classic MKII at the top of the series, and the L100 MKII stays on sale.
What amplifier does the JBL L150 Classic need?
A strong one that is stable into 4 ohms. JBL rates it at 88 dB at 2.83 volts and recommends up to 250 watts. On paper, loud 100 dB peaks at 3 metres need about 140 watts per channel.
How big is the JBL L150 Classic?
935 mm tall, 470 mm wide and 540 mm deep with the grille, and 58.5 kg each, according to JBL’s product page.
A 15-inch JBL that needs a big amplifier, or a Cornwall IV that runs on almost anything? Which would you put in your room?